In practice an MP can't represent everyone equally though. If you vote for abortion you will very much go against the wishes of half the population. Vote against it and you'll upset the other half. In practice members must make their decisions on a case by case basis, hopefully taking their constituents views into account. Sometimes they won't of course, otherwise we'd still be hanging people. As for parties, isn't that a case of people with reasonably like minds banding together to get things done? Wouldn't the floor of the house just be chaos without some form of organisation .. you vote for me on this and I'll vote for you on that, the start of a party as it were?
I'm just musing JP, I suspect someone who has studied politics as a degree or higher would shoot that all down. Maybe even if they haven't
Just my own humble thoughts, no more.